Link local package into dummy app

We need the current js packaghe to run specs,
because it might be that we have changed them in the same branch.

Rakefile

@@ -41,12 +41,15 @@ namespace :alchemy do
     task :prepare do
       system(
         <<~BASH
+          yarn install && \
+          yarn link && \
           cd spec/dummy && \
           export RAILS_ENV=test && \
           bin/rake db:create && \
           bin/rake db:environment:set && \
           bin/rake db:migrate:reset && \
           bin/rails g alchemy:install --skip --skip-demo-files --auto-accept && \
+          yarn link @alchemy_cms/admin && \
           RAILS_ENV=test bin/webpack && \
           cd -
         BASH